Process for producing foamed polystyrene boards

Details Process for producing foamed polystyrene boards Process for producing foamed polystyrene boards

1979-05-17

1981-04-07

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264211, 264DIG5, B29D 2700

Patent

active

042605725

ABSTRACT:
A foamed polystyrene board useful as a thermal insulating material is produced by melting a polystyrene having a melt index of from 0.5 to 5 under heat in an extruder, mixing the molten mass with a blowing agent composed of methyl chloride and dichlorodifluoromethane, and extruding the resulting foamable molten gel from the extruder. As a novel essential feature, a flowability improver having a melting point higher than 70.degree. C., such as an aromatic sulfonamide, a brominated aromatic compound, a brominated alicyclic compound or a poly(.alpha.-methylstyrene), is mixed with the polystyrene within the extruder to impart superior extrusion formability. The foam has good dimensional stability both at room temperature and higher temperature, high mechanical strength and superior thermal insulation properties.

REFERENCES:
patent: 2384521 (1945-09-01), Andersen et al.
patent: 3121130 (1964-02-01), Wiley et al.
patent: 3151192 (1964-09-01), Jacobs et al.
patent: 3223664 (1965-12-01), Conlon
patent: 3751377 (1973-08-01), Buckner
patent: 3956203 (1976-05-01), Burger et al.
patent: 4075265 (1978-02-01), McClung et al.
patent: 4136142 (1979-01-01), Hargreaves et al.

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